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An implantable cardioverter-defibrillator (ICD) is a small battery-powered device placed in the chest. It detects and stops irregular heartbeats, also called arrhythmias. An ICD continuously checks the heartbeat. It delivers electric shocks, when needed, to restore a regular heart rhythm.
You might need an ICD if you have a dangerously fast heartbeat called ventricular tachycardia or ventricular fibrillation. An ICD also may be recommended if you're at high risk of dangerous irregular heartbeats, usually because of a weak heart muscle.
An ICD isn't the same as a pacemaker. A pacemaker is a device used to prevent dangerously slow heartbeats.
An ICD is a type of cardiac therapy device. There are two basic types: